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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb7b81b0cf9690ebd01e16265529a15997f79d7bb7094c4021d29b2451af370' 
  AND token = 'GQMby45gROrnDyqgPd1Ll7jkhfeNX8rPvjIFvL24aK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}